<template>
  <div>
    <div class="todo-header">
      <input
        type="text"
        placeholder="请输入你的任务名称，按回车键确认"
        @keyup.enter="add"
      />
    </div>
  </div>
</template>

<script>
import { nanoid } from "nanoid";
//nanoid是一个函数，直接调用就行
export default {
  name: "myHeader",
  props: ["receive"],
  methods: {
    add(event) {
      //校验数据，前后不能为空
      if (!event.target.value.trim()) return alert("不能输入空信息");
      const todoObj = { id: nanoid(), title: event.target.value, done: false };
      this.receive(todoObj);
      event.target.value = "";
      //但是这块就是在操作dom了，如果不用value的话，在input表单用v-model
    },
  },
};
</script>

<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
    0 0 8px rgba(82, 168, 236, 0.6);
}
</style>
